Pocket Peepers are a reading lens which you pop into a slot along with your credit cards. They're really useful if you misplace or lose your glasses. And for small print in phone books, road maps, and restaurant menus.
Increasingly Pocket Peepers seem to be doing their best work magnifying the tiny print used for additives and preservatives in foods.
Pocket Peepers are an optical reading lens, polymer-coated to be scratch resistant. Just move it toward or away from reading material, and it will magnify from +1.25 to +2.50 depending on distance. Their American creator reckons they stop baby boomers looking like codgers.